Electronic announcement and siren signal generator and...

Measuring – testing – or signalling instruments – Security or signal instrument or casing – Alarm or control thereof

Design Patent

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Design Patent

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D0503644

CLAIM:
The ornamental design for an electronic announcement and siren signal generator and control unit, as shown and described.

REFERENCES:
patent: D412678 (1999-08-01), Smith et al.
patent: 6411207 (2002-06-01), Shaffer
patent: D494881 (2004-08-01), Niemi et al.
patent: D497319 (2004-10-01), Shaanan

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